Resetting price histories i think isn't a fair idea. It just means to cull the undercutting you invite over-pricing, which means buyers will know to wait till before the reset when everyones done undercutting eachother cause no one will want to buy anything when the history has just been reset and knows that everyone will repost as high as they can to start.

If the reset was on tuesday i'd do all my shopping on monday.

I realize undercutting is a problem here, perhaps more so then many other titles, but you will always see undercutting if someone can make make a profit below your sale price they are likely to do it. And it happens in FF14, other MMOs, Virtual and real life (barring monopolies and collusion).

I'm selling on my server in Gridania, both retainers. And profiting modestly. Modest yet fairly constant profit a workable solution.